libvips/libsrc/resample/snohalo1.cpp

637 lines
21 KiB
C++

/* snohalo (smooth nohalo) level 1 interpolator
*
*/
/*
This file is part of VIPS.
VIPS is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this program; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
/*
* 2009 (c) Nicolas Robidoux
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <vips/intl.h>
#include <stdio.h>
#include <stdlib.h>
#include <vips/vips.h>
#include <vips/internal.h>
#include "templates.h"
/*
* FAST_PSEUDO_FLOOR is a floor and floorf replacement which has been
* found to be faster on several linux boxes than the library
* version. It returns the floor of its argument unless the argument
* is a negative integer, in which case it returns one less than the
* floor. For example:
*
* FAST_PSEUDO_FLOOR(0.5) = 0
*
* FAST_PSEUDO_FLOOR(0.) = 0
*
* FAST_PSEUDO_FLOOR(-.5) = -1
*
* as expected, but
*
* FAST_PSEUDO_FLOOR(-1.) = -2
*
* The locations of the discontinuities of FAST_PSEUDO_FLOOR are the
* same as floor and floorf; it is just that at negative integers the
* function is discontinuous on the right instead of the left.
*/
#define FAST_PSEUDO_FLOOR(x) ( (int)(x) - ( (x) < 0. ) )
/*
* FAST_MINMOD is an implementation of the minmod function which only
* needs two conditional moves. (Nicolas: I think that this may be
* the very first two branch minmod.) The product of the two arguments
* and a useful difference involving them are also precomputed to keep
* them out of branching way.
*/
#define FAST_MINMOD(a,b,ab,abminusaa) \
( (ab)>=0. ? ( (abminusaa)>=0. ? (a) : (b) ) : 0. )
/* Properties.
*/
enum {
PROP_BLUR = 1,
PROP_LAST
};
#define VIPS_TYPE_INTERPOLATE_SNOHALO1 \
(vips_interpolate_snohalo1_get_type())
#define VIPS_INTERPOLATE_SNOHALO1( obj ) \
(G_TYPE_CHECK_INSTANCE_CAST( (obj), \
VIPS_TYPE_INTERPOLATE_SNOHALO1, VipsInterpolateSnohalo1 ))
#define VIPS_INTERPOLATE_SNOHALO1_CLASS( klass ) \
(G_TYPE_CHECK_CLASS_CAST( (klass), \
VIPS_TYPE_INTERPOLATE_SNOHALO1, VipsInterpolateSnohalo1Class))
#define VIPS_IS_INTERPOLATE_SNOHALO1( obj ) \
(G_TYPE_CHECK_INSTANCE_TYPE( (obj), VIPS_TYPE_INTERPOLATE_SNOHALO1 ))
#define VIPS_IS_INTERPOLATE_SNOHALO1_CLASS( klass ) \
(G_TYPE_CHECK_CLASS_TYPE( (klass), VIPS_TYPE_INTERPOLATE_SNOHALO1 ))
#define VIPS_INTERPOLATE_SNOHALO1_GET_CLASS( obj ) \
(G_TYPE_INSTANCE_GET_CLASS( (obj), \
VIPS_TYPE_INTERPOLATE_SNOHALO1, VipsInterpolateSnohalo1Class ))
typedef struct _VipsInterpolateSnohalo1 {
VipsInterpolate parent_object;
double blur;
} VipsInterpolateSnohalo1;
typedef struct _VipsInterpolateSnohalo1Class {
VipsInterpolateClass parent_class;
} VipsInterpolateSnohalo1Class;
static void inline
snohalo1( const double blur,
const double zer_two_in,
const double zer_thr_in,
const double uno_one_in,
const double uno_two_in,
const double uno_thr_in,
const double uno_fou_in,
const double dos_zer_in,
const double dos_one_in,
const double dos_two_in,
const double dos_thr_in,
const double dos_fou_in,
const double dos_fiv_in,
const double tre_zer_in,
const double tre_one_in,
const double tre_two_in,
const double tre_thr_in,
const double tre_fou_in,
const double tre_fiv_in,
const double qua_one_in,
const double qua_two_in,
const double qua_thr_in,
const double qua_fou_in,
const double cin_two_in,
const double cin_thr_in,
double* restrict r0,
double* restrict r1,
double* restrict r2,
double* restrict r3 )
{
const double beta = 1. + -.5 * blur;
const double gamma = .125 * blur;
/*
* Computation of the blurred pixel values:
*/
const double uno_one_plus_zer_two_in = uno_one_in + zer_two_in;
const double uno_two_plus_zer_thr_in = uno_two_in + zer_thr_in;
const double dos_zer_plus_uno_one_in = dos_zer_in + uno_one_in;
const double dos_one_plus_uno_two_in = dos_one_in + uno_two_in;
const double dos_two_plus_uno_thr_in = dos_two_in + uno_thr_in;
const double dos_thr_plus_uno_fou_in = dos_thr_in + uno_fou_in;
const double tre_zer_plus_dos_one_in = tre_zer_in + dos_one_in;
const double tre_one_plus_dos_two_in = tre_one_in + dos_two_in;
const double tre_two_plus_dos_thr_in = tre_two_in + dos_thr_in;
const double tre_thr_plus_dos_fou_in = tre_thr_in + dos_fou_in;
const double tre_fou_plus_dos_fiv_in = tre_fou_in + dos_fiv_in;
const double qua_one_plus_tre_two_in = qua_one_in + tre_two_in;
const double qua_two_plus_tre_thr_in = qua_two_in + tre_thr_in;
const double qua_thr_plus_tre_fou_in = qua_thr_in + tre_fou_in;
const double qua_fou_plus_tre_fiv_in = qua_fou_in + tre_fiv_in;
const double cin_two_plus_qua_thr_in = cin_two_in + qua_thr_in;
const double cin_thr_plus_qua_fou_in = cin_thr_in + qua_fou_in;
const double uno_two =
beta * uno_two_in
+
( uno_one_plus_zer_two_in + dos_two_plus_uno_thr_in ) * gamma;
const double uno_thr =
beta * uno_thr_in
+
( uno_two_plus_zer_thr_in + dos_thr_plus_uno_fou_in ) * gamma;
const double dos_one =
beta * dos_one_in
+
( dos_zer_plus_uno_one_in + tre_one_plus_dos_two_in ) * gamma;
const double dos_two =
beta * dos_two_in
+
( dos_one_plus_uno_two_in + tre_two_plus_dos_thr_in ) * gamma;
const double dos_thr =
beta * dos_thr_in
+
( dos_two_plus_uno_thr_in + tre_thr_plus_dos_fou_in ) * gamma;
const double dos_fou =
beta * dos_fou_in
+
( dos_thr_plus_uno_fou_in + tre_fou_plus_dos_fiv_in ) * gamma;
const double tre_one =
beta * tre_one_in
+
( tre_zer_plus_dos_one_in + qua_one_plus_tre_two_in ) * gamma;
const double tre_two =
beta * tre_two_in
+
( tre_one_plus_dos_two_in + qua_two_plus_tre_thr_in ) * gamma;
const double tre_thr =
beta * tre_thr_in
+
( tre_two_plus_dos_thr_in + qua_thr_plus_tre_fou_in ) * gamma;
const double tre_fou =
beta * tre_fou_in
+
( tre_thr_plus_dos_fou_in + qua_fou_plus_tre_fiv_in ) * gamma;
const double qua_two =
beta * qua_two_in
+
( qua_one_plus_tre_two_in + cin_two_plus_qua_thr_in ) * gamma;
const double qua_thr =
beta * qua_thr_in
+
( qua_two_plus_tre_thr_in + cin_thr_plus_qua_fou_in ) * gamma;
/*
* Dos(s) horizontal differences:
*/
const double prem_dos = dos_two - dos_one;
const double deux_dos = dos_thr - dos_two;
const double troi_dos = dos_fou - dos_thr;
/*
* Tre(s) horizontal differences:
*/
const double prem_tre = tre_two - tre_one;
const double deux_tre = tre_thr - tre_two;
const double troi_tre = tre_fou - tre_thr;
/*
* Two vertical differences:
*/
const double prem_two = dos_two - uno_two;
const double deux_two = tre_two - dos_two;
const double troi_two = qua_two - tre_two;
/*
* Thr(ee) vertical differences:
*/
const double prem_thr = dos_thr - uno_thr;
const double deux_thr = tre_thr - dos_thr;
const double troi_thr = qua_thr - tre_thr;
/*
* Apply minmod to comsecutive differences:
*/
/*
* Products and differences useful for minmod:
*/
const double deux_prem_dos = deux_dos * prem_dos;
const double deux_deux_dos = deux_dos * deux_dos;
const double deux_troi_dos = deux_dos * troi_dos;
const double deux_prem_two = deux_two * prem_two;
const double deux_deux_two = deux_two * deux_two;
const double deux_troi_two = deux_two * troi_two;
const double deux_prem_minus_deux_deux_dos = deux_prem_dos - deux_deux_dos;
const double deux_troi_minus_deux_deux_dos = deux_troi_dos - deux_deux_dos;
const double deux_prem_minus_deux_deux_two = deux_prem_two - deux_deux_two;
const double deux_troi_minus_deux_deux_two = deux_troi_two - deux_deux_two;
const double deux_prem_tre = deux_tre * prem_tre;
const double deux_deux_tre = deux_tre * deux_tre;
const double deux_troi_tre = deux_tre * troi_tre;
const double deux_prem_thr = deux_thr * prem_thr;
const double deux_deux_thr = deux_thr * deux_thr;
const double deux_troi_thr = deux_thr * troi_thr;
const double deux_prem_minus_deux_deux_tre = deux_prem_tre - deux_deux_tre;
const double deux_troi_minus_deux_deux_tre = deux_troi_tre - deux_deux_tre;
const double deux_prem_minus_deux_deux_thr = deux_prem_thr - deux_deux_thr;
const double deux_troi_minus_deux_deux_thr = deux_troi_thr - deux_deux_thr;
/*
* Useful sums:
*/
const double dos_two_plus_dos_thr = dos_two + dos_thr;
const double dos_two_plus_tre_two = dos_two + tre_two;
const double deux_thr_plus_deux_dos = deux_thr + deux_dos;
/*
* Compute the needed "right" (at the boundary between one input
* pixel areas) double resolution pixel value:
*/
const double four_times_dos_twothr =
FAST_MINMOD( deux_dos, prem_dos, deux_prem_dos,
deux_prem_minus_deux_deux_dos )
-
FAST_MINMOD( deux_dos, troi_dos, deux_troi_dos,
deux_troi_minus_deux_deux_dos )
+
2. * dos_two_plus_dos_thr;
/*
* Compute the needed "down" double resolution pixel value:
*/
const double four_times_dostre_two =
FAST_MINMOD( deux_two, prem_two, deux_prem_two,
deux_prem_minus_deux_deux_two )
-
FAST_MINMOD( deux_two, troi_two, deux_troi_two,
deux_troi_minus_deux_deux_two )
+
2. * dos_two_plus_tre_two;
/*
* Compute the "diagonal" (at the boundary between thrr input
* pixel areas) double resolution pixel value:
*/
const double piece_of_eight_times_dostre_twothr =
four_times_dos_twothr
+
four_times_dostre_two
+
2. * deux_thr_plus_deux_dos;
const double eight_times_dostre_twothr =
FAST_MINMOD( deux_tre, prem_tre, deux_prem_tre,
deux_prem_minus_deux_deux_tre )
-
FAST_MINMOD( deux_tre, troi_tre, deux_troi_tre,
deux_troi_minus_deux_deux_tre )
+
FAST_MINMOD( deux_thr, prem_thr, deux_prem_thr,
deux_prem_minus_deux_deux_thr )
-
FAST_MINMOD( deux_thr, troi_thr, deux_troi_thr,
deux_troi_minus_deux_deux_thr )
+
piece_of_eight_times_dostre_twothr;
/*
* Return the first newly computed double density values:
*/
*r0 = dos_two;
*r1 = four_times_dos_twothr;
*r2 = four_times_dostre_two;
*r3 = eight_times_dostre_twothr;
}
/* Call snohalo1 with an interpolator as a parameter.
* It'd be nice to do this with templates somehow :-( but I can't see a
* clean way to do it.
*/
#define SNOHALO1_INTER( inter ) \
template <typename T> static void inline \
snohalo1_ ## inter( PEL* restrict pout, \
const PEL* restrict pin, \
const int bands, \
const int lskip, \
const double blur, \
const double relative_x, \
const double relative_y ) \
{ \
T* restrict out = (T *) pout; \
\
const int relative_x_is_rite = ( relative_x >= 0. ); \
const int relative_y_is_down = ( relative_y >= 0. ); \
\
const int sign_of_relative_x = 2 * relative_x_is_rite - 1; \
const int sign_of_relative_y = 2 * relative_y_is_down - 1; \
\
const int corner_reflection_shift = \
relative_x_is_rite * bands + relative_y_is_down * lskip; \
\
const int shift_back_1_pixel = sign_of_relative_x * bands; \
const int shift_back_1_row = sign_of_relative_y * lskip; \
\
const T* restrict in = ( (T *) pin ) + corner_reflection_shift; \
\
const int shift_forw_1_pixel = -shift_back_1_pixel; \
const int shift_forw_1_row = -shift_back_1_row; \
\
const int shift_back_2_pixel = 2 * shift_back_1_pixel; \
const int shift_back_2_row = 2 * shift_back_2_row; \
\
const double w = ( 2 * sign_of_relative_x ) * relative_x; \
const double z = ( 2 * sign_of_relative_y ) * relative_y; \
\
const int shift_forw_2_pixel = 2 * shift_forw_1_pixel; \
const int shift_forw_2_row = 2 * shift_forw_1_row; \
\
const int shift_forw_3_pixel = 3 * shift_forw_1_pixel; \
const int shift_forw_3_row = 3 * shift_forw_1_row; \
\
const int zer_two_shift = shift_back_2_row; \
const int zer_thr_shift = shift_forw_1_pixel + shift_back_2_row; \
\
const int uno_one_shift = shift_back_1_pixel + shift_back_1_row; \
const int uno_two_shift = shift_back_1_row; \
const int uno_thr_shift = shift_forw_1_pixel + shift_back_1_row; \
const int uno_fou_shift = shift_forw_2_pixel + shift_back_1_row; \
\
const double x = 1. - w; \
const double w_times_z = w * z; \
\
const int dos_zer_shift = shift_back_2_pixel; \
const int dos_one_shift = shift_back_1_pixel; \
const int dos_two_shift = 0; \
const int dos_thr_shift = shift_forw_1_pixel; \
const int dos_fou_shift = shift_forw_2_pixel; \
const int dos_fiv_shift = shift_forw_3_pixel; \
\
const int tre_zer_shift = shift_back_2_pixel + shift_forw_1_row; \
const int tre_one_shift = shift_back_1_pixel + shift_forw_1_row; \
const int tre_two_shift = shift_forw_1_row; \
const int tre_thr_shift = shift_forw_1_pixel + shift_forw_1_row; \
const int tre_fou_shift = shift_forw_2_pixel + shift_forw_1_row; \
const int tre_fiv_shift = shift_forw_3_pixel + shift_forw_1_row; \
\
const double x_times_z = x * z; \
\
const int qua_one_shift = shift_back_1_pixel + shift_forw_2_row; \
const int qua_two_shift = shift_forw_2_row; \
const int qua_thr_shift = shift_forw_1_pixel + shift_forw_2_row; \
const int qua_fou_shift = shift_forw_2_pixel + shift_forw_2_row; \
\
const int cin_two_shift = shift_forw_3_row; \
const int cin_thr_shift = shift_forw_1_pixel + shift_forw_3_row; \
\
const double w_times_y_over_4 = .25 * ( w - w_times_z ); \
const double x_times_z_over_4 = .25 * x_times_z; \
const double x_times_y_over_8 = .125 * ( x - x_times_z ); \
\
int band = bands; \
\
do \
{ \
double dos_two; \
double four_times_dos_twothr; \
double four_times_dostre_two; \
double eight_times_dostre_twothr; \
\
snohalo1( blur, \
in[zer_two_shift], in[zer_thr_shift], \
in[uno_one_shift], in[uno_two_shift], \
in[uno_thr_shift], in[uno_fou_shift], \
in[dos_zer_shift], in[dos_one_shift], \
in[dos_two_shift], in[dos_thr_shift], \
in[dos_fou_shift], in[dos_fiv_shift], \
in[tre_zer_shift], in[tre_one_shift], \
in[tre_two_shift], in[tre_thr_shift], \
in[tre_fou_shift], in[tre_fiv_shift], \
in[qua_one_shift], in[qua_two_shift], \
in[qua_thr_shift], in[qua_fou_shift], \
in[cin_two_shift], in[cin_thr_shift], \
&dos_two, \
&four_times_dos_twothr, \
&four_times_dostre_two, \
&eight_times_dostre_twothr ); \
\
const T result = bilinear_ ## inter<T>( w_times_z, \
x_times_z_over_4, \
w_times_y_over_4, \
x_times_y_over_8, \
dos_two, \
four_times_dos_twothr, \
four_times_dostre_two, \
eight_times_dostre_twothr ); \
\
in++; \
*out++ = result; \
} while (--band); \
}
SNOHALO1_INTER( float )
SNOHALO1_INTER( signed )
SNOHALO1_INTER( unsigned )
/* We need C linkage for this.
*/
extern "C" {
G_DEFINE_TYPE( VipsInterpolateSnohalo1, vips_interpolate_snohalo1,
VIPS_TYPE_INTERPOLATE );
}
static void
vips_interpolate_snohalo1_interpolate( VipsInterpolate* restrict interpolate,
PEL* restrict out,
REGION* restrict in,
double absolute_x,
double absolute_y )
{
VipsInterpolateSnohalo1 *snohalo1 =
VIPS_INTERPOLATE_SNOHALO1( interpolate );
/*
* VIPS versions of Nicolas's pixel addressing values.
*/
const int actual_bands = in->im->Bands;
const int lskip = IM_REGION_LSKIP( in ) / IM_IMAGE_SIZEOF_ELEMENT( in->im );
const double absolute_y_minus_half = absolute_y - .5;
const double absolute_x_minus_half = absolute_x - .5;
/*
* floor's surrogate FAST_PSEUDO_FLOOR is used to make sure that the
* transition through 0 is smooth. If it is known that absolute_x
* and absolute_y will never be less than 0, plain cast---that is,
* const int ix = absolute_x---should be used instead. Actually,
* any function which agrees with floor for non-integer values, and
* picks one of the two possibilities for integer values, can be
* used. FAST_PSEUDO_FLOOR fits the bill.
*
* Then, x is the x-coordinate of the sampling point relative to the
* position of the center of the convex hull of the 2x2 block of
* closest pixels. Similarly for y. Range of values: [-.5,.5).
*/
const int iy = FAST_PSEUDO_FLOOR (absolute_y);
const double relative_y = absolute_y_minus_half - iy;
const int ix = FAST_PSEUDO_FLOOR (absolute_x);
const double relative_x = absolute_x_minus_half - ix;
/*
* Move the pointer to (the first band of) the top/left pixel of the
* 2x2 group of pixel centers which contains the sampling location
* in its convex hull:
*/
const PEL* restrict p = (PEL *) IM_REGION_ADDR( in, ix, iy );
/*
* Double bands for complex images:
*/
const int bands =
( im_iscomplex( in->im ) ? 2 * actual_bands : actual_bands );
#define CALL( T, inter ) \
snohalo1_ ## inter<T>( out, \
p, \
bands, \
lskip, \
snohalo1->blur, \
relative_x, \
relative_y );
switch( in->im->BandFmt ) {
case IM_BANDFMT_UCHAR:
CALL( unsigned char, unsigned );
break;
case IM_BANDFMT_CHAR:
CALL( signed char, signed );
break;
case IM_BANDFMT_USHORT:
CALL( unsigned short, unsigned );
break;
case IM_BANDFMT_SHORT:
CALL( signed short, signed );
break;
case IM_BANDFMT_UINT:
CALL( unsigned int, unsigned );
break;
case IM_BANDFMT_INT:
CALL( signed int, signed );
break;
/* Complex images handled by doubling of bands, see above.
*/
case IM_BANDFMT_FLOAT:
case IM_BANDFMT_COMPLEX:
CALL( float, float );
break;
case IM_BANDFMT_DOUBLE:
case IM_BANDFMT_DPCOMPLEX:
CALL( double, float );
break;
default:
g_assert( 0 );
break;
}
}
static void
vips_interpolate_snohalo1_class_init( VipsInterpolateSnohalo1Class *klass )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( klass );
VipsObjectClass *object_class = VIPS_OBJECT_CLASS( klass );
VipsInterpolateClass *interpolate_class =
VIPS_INTERPOLATE_CLASS( klass );
GParamSpec *pspec;
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
object_class->nickname = "snohalo1";
object_class->description = _( "Nohalo level 1 with antialiasing blur" );
interpolate_class->interpolate =
vips_interpolate_snohalo1_interpolate;
interpolate_class->window_size = 6;
/* Create properties.
*/
pspec =
g_param_spec_double( "blur",
_( "Blur" ),
_( "Amount of diagonal straightening blur" ),
0, 4, 1,
(GParamFlags) G_PARAM_READWRITE );
g_object_class_install_property( gobject_class,
PROP_BLUR, pspec );
vips_object_class_install_argument( object_class, pspec,
VIPS_ARGUMENT_SET_ONCE,
G_STRUCT_OFFSET( VipsInterpolateSnohalo1, blur ) );
}
static void
vips_interpolate_snohalo1_init( VipsInterpolateSnohalo1 *snohalo1 )
{
}